Ice age

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Across
  1. 2. The instrument used to obtain the ice core.
  2. 4. The period during ice age where ice sheet advances.
  3. 5. Process when water turns into ice.
  4. 6. The position where the newest peatbog found in the core.
Down
  1. 1. Criteria for ice to be an ice age.
  2. 3. Large, slow moving river of ice.